摘要
主量元素全碱 -硅投影显示青山脚岩体岩性为闪长岩、石英闪长岩 ;里特曼指数计算结果表明岩性呈钙碱性 ;岩体中Cu呈明显的正异常 ,说明含铜岩浆热液一方面叠加改造原始矿胚层 ,使层状铜矿进一步富集 ;另一方面含铜的岩浆热液在岩体边缘或接触带形成浸染状、网脉状矿床 (既斑岩型矿床 )。钾化与Cu富集呈正相关 ,钾化越强 ,Cu富集程度越高。稀土元素球粒陨石标准化曲线显示轻稀土富集重稀土亏损 ;δEu接近 1 0 ,说明岩体分异演化程度不高。该岩体是重要的成矿物质和成矿流体来源 ,岩浆侵入与岩浆热液的叠加改造促使矿床规模扩大、品位提高。
Total alkali-silicon projection of macro element reveals the rock mass in Qingshanjiao is diorite and quartz diorite, calc-alkaline in lithology is calculated by Rittman Index. Copper reveals a distinct positive anomaly, showing copper-bearing magma thermal fluid superimposed and changed the primary protore bed, making a further enrichment of layered copper deposit on one hand, the copper-bearing magma thermal fluid formed contaminated and netted deposits (porphyry deposit) in the margin or contact zone of rock mass on the other hand. Potassium and enriched copper assumed positive relationship, the stronger the potassium, the higher the copper enrichment will be. The standard curve of chondrite of rare earth element reveals a deficit of light rare earth enriched the heavy one; δEu reaches 1.0, showing a low degree of fifferential evolution of rock mass. The studied rock mass is the important source of metallogenic materials and ore-forming fluids. The magma intrusion and the superimposition and rebuilding of magma thermal fluid enlarge the scale of deposit increase the grade.
出处
《江苏地质》
2001年第2期87-91,共5页
Jiangsu Geology
基金
国家自然科学基金资助项目 ( 4 98730 16 )
